2486 lb car 15x16 5 to 5.5 lbs air pressure.
Every car/chassis will be different. You'll need to spend a little time at the track during day and evening conditions so you can determine how your car reacts to the differing track temps and humidities. A lot of times during the day the track will be hot with very little humidity, where during night racing the track may be cooler and the humidity levels are creating track surface moisture.
I would start out around 8-9 lbs of tire pressure and work your way down with the tire pressure.
Make sure you complete each run so you can get a feel of the car and the way it handles on the tall end of the track.
Have someone video the run at the end of the track and narate whats happening including commenting on the amount of tire pressure during each run. Look to see if that car is squatting down and grabbing the track or if the rear end is rising up due to lack of traction, causing the backend of the car to dance around...